Cost-reduced multi-purpose NFC transceiver chip

Cost-reduced multi-purpose NFC transceiver chip

New Products |
By Nick Flaherty

STMicroelectronics has launched a cost-reduced version of its flagship ST25R3916 NFC reader.

The ST25R3918 enables use cases such as accessory identification for a wide range of applications including power tools and personal healthcare devices where the transceiver interacts seamlessly with NFC tags. Its close relationship to the ST25R3916 simplifies hardware design and certification.

The ST25R3918 supports both FFC-A and NFC-F card emulation and can be used as an NFC-A/B (ISO 14443A/B) card reader up to high bit rates as well as an NFC-V (ISO 15693) reader up to 53 kbps. The card emulation mode allows support for the newest features available on mobile phones.

It can also be used as an ISO 18092 passive initiator and target.

The chip supports device programming and simple NDEF data transfers but it also has special stream and transparent modes of the analogue front end (AFE) and framing system to implement other custom protocols in card-reader and card-emulation modes.

Combined with the reader mode, the ST25R3918 supports scanning for tags nearby for tasks such as replaceable detection and parameter setting, or simply reading an access card.

ST’s Noise Suppression Receiver (NSR) technology extends the read range and can be operated with output power around 0.5W in noisy and harsh environments. The ST25R3918 also includes a low-power card-detection mode to scan for the presence of a card by measuring the amplitude or phase of the antenna signal. A low-power RC oscillator and wake-up timer automatically reactivates the ST25R3918 after a selected time period to check for the presence of a tag.

Additional features to maximize the performance and value from this transceiver include support for Dynamic Power Output (DPO), which automatically controls the field strength to meet the required limits. On top of this, Active Wave Shaping (AWS) smooths the waveform for better signal integrity.

The ST25R3918 operates from a wide power-supply voltage range of 2.6V–5.5V between -40°C and 85°C, and 2.4V-5.5V in the temperature range from -20°C to 85°C, with a peripheral-I/O voltage range of 1.65V-5.5V.

The ST25R3918 is available now, priced at $1.80 in quantities of 1,000 units.

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